Original Vintage Hermle Clock Key-4mm x 4mm, N0-7

Vintage Hermle Clock Key 4Mm – Original Vintage Winding Key

This original vintage Hermle clock key 4mm is a genuine older winding key for a compatible mechanical clock. The square opening measures 4mm x 4mm and is listed as No.7. Hallmarked on both sides as shown.

Original period keys are useful in sympathetic antique-clock restoration because they retain more of the character of the clock than a modern generic replacement. They are also useful when completing a clock that has lost its original winding key.

The most important compatibility check is the internal square opening. A correctly sized key should fit the winding arbor securely without excessive play. A loose key may slip and round the arbor corners, while an undersized key should never be forced.

Product Details

• Brand / marking: Hermle
• Square opening: 4mm x 4mm
• Listed key size: No.7
• Overall dimensions: approx. 74mm x 58mm
• Material: Metal
• Condition: Original vintage / used
• Quantity: 1 key

Important

Measure the winding arbor accurately before ordering. Key-number systems can vary, so the millimetre measurement of the internal square opening should be used as the primary compatibility check.

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